The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 2015
Filed:
Jan. 23, 2014
Semiconductor Manufacturing International (Shanghai) Corporation, Shanghai, CN;
Jialei Liu, Shanghai, CN;
Abstract
A method is provided for fabricating a PMOS transistor. The method includes providing a semiconductor substrate; and forming gate structures on a surface of the semiconductor substrate. The method also includes forming sidewall spacers around the gate structures; and forming a protection layer on the sidewall spacers. Further, the method includes forming sigma shape trenches in the semiconductor substrate at sides of the gate structures; and forming SiGe structures with a surface protruding from the surface of the semiconductor substrate in the sigma shape trenches. Further, the method also includes removing the sidewall spacers and a portion of the protection layer; and forming lightly doped drain regions in the semiconductor substrate at both sides of the gate structures.